Speed in a straight line measures an object's ( aeroplane,helicopter, car or boat) average speed over a specified distance in both directions.
Normally you can do 2 runs in each direction to get the best speed in each direction, to get the average speed. The average speed is then published on this website.
Speed measurement is done by camera, and the gate or area that you have to fly pass the camera to be registered is set to be a bottom distance 5 meters from the ground and the top distance 35 meters from the ground.
The difference in entry and exit height may not be more than 4.5 meters or 15% of gate height to make it a valid run.
Tips for gettting better speed with a flying object
Get maximum height (not exceeding your area's ceiling limit), before diving down and then enter the speed zone.
While in the speed measuring zone, do not fiddle with the object because every movement translates to speed loss.